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Experimental study of interfaces in Van Der Waals heterostructures
Descriptive
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Title
Experimental study of interfaces in Van Der Waals heterostructures
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Altvater
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Michael
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Michael Altvater
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author
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Andrei
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Eva Y
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Eva Y Andrei
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Advisory Committee
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chair
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Chakhalian
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Jak
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Jak Chakhalian
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Advisory Committee
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internal member
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Lee
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Sang-Hyuk
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Sang-Hyuk Lee
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Advisory Committee
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internal member
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Andrei
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Natan
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Natan Andrei
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Advisory Committee
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internal member
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Luican-Mayer
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Adina
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Adina Luican-Mayer
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Advisory Committee
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outside member
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Rutgers University
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degree grantor
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School of Graduate Studies
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school
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theses
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2020
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2020-10
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English
Abstract
The advent of 2D materials and heterostructrures built from them has unleashed a huge potential to create and control novel electron systems. This thesis experimentally explores physical effects on the electronic states at the interfaces of 2D materials using electrostatic atomic force microscopy (AFM) and scanning tunneling microscopy (STM). The findings described herein include the observation of atomically thin graphene and its local charge distributions through an insulating encapsulant using electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM). Similar to encapsulation with hexagonal boron nitride (hBN), it is shown that covering a 2D material surface using monolayer graphene protects from damaging interactions with the environment, preventing detrimental oxidation of the sample surface in ambient conditions, with the added benefit of being able to image local charge distributions at atomic scales through the cover layer. Using this method, we image the room temperature charge density wave (CDW) phase of 1T-TaS2, a highly correlated 2D material, and identify the ordering of topological defects of the 2D CDW state to be related to that of Abrikosov vortex lattices in type II superconductor films. The interaction between the graphene layer and the 1T-TaS2 surface is further probed at 77K where 1T-TaS2 exhibits a commensurate CDW coupled to a Mott insulating electronic phase. Itinerant carriers within the graphene layer are found to screen the electron-electron interactions and reduce the Mott gap size at the 1T-TaS2 surface. Simultaneously, a charge density wave is observed to be induced in the graphene layer that is analogous to the superconducting proximity effect. The novel CDW proximity effect is found to be well captured within density functional theory (DFT) as well as with a simplified mean field Hamiltonian which allows the effect to be generalized to other materials.
Subject
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Topic
Physics and Astronomy
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Title
Rutgers University Electronic Theses and Dissertations
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ETD
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ETD_11234
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application/pdf
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Extent
1 online resource (xi, 192 pages)
Note
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Ph.D.
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Includes bibliographical references
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ETD doctoral
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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NjNbRU
Identifier
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doi:10.7282/t3-fce9-es82
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Rights
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The author owns the copyright to this work.
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Name
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Altvater
GivenName
Michael
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Permission or license
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2020-09-29 00:05:52
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Michael Altvater
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Affiliation
Rutgers University. School of Graduate Studies
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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2020-09-29T15:25:07
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2020-09-29T15:25:07
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